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Help on I2C interface of MSP430F155

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ilikebbs

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Now there are 2 cpu on my board. One is MPC8260, the other is MSP430.
MPC8260 can access other device on the I2C bus successfully.
But when MPC8260 access the MSP430, the I2C bus will be pulled low.
I do not why.

I use RC reset for MSP430.
when the board is power on, I try to reset MSP430 with a nipper. I short the capacitor of RC. Then MPC8260 can access the MSP430 successfully. It seems that the MSP430 does not reset successfully.
The value of RC is 47k ohm and 0.1u .

Anyone can give me suggestion?
 

help!!!!!
Anyone can give me suggestion?
 
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    wihe5a

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Hi

Replace your RC reset network with reset IC like TPS3828

All the Best

Bobi
 

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